Physiological, Biochemical and Anatomical Changes Leading to Graft Incompatibility in Pear
Loading...
Date
2019
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Punjab Agricultural University, Ludhiana
Abstract
The present study entitled ‘Physiological, biochemical and anatomical changes leading to
graft incompatibility in Pear’ was conducted at Plant Physiology Lab, Department of Botany,
and Fruit Research Farm, PAU, Ludhiana during 2016-2018. The study was performed after 6
and 18 months of grafting (stages) to investigate the primary causes of graft incompatibility in
Pear (Pyrus sp.). Semi soft pear cv. Punjab Beauty (Pyrus pyrifolia x Pyrus communis) and
Hard pear cv. Punjab Nakh (Pyrus pyrifolia) were grafted in January onto one year old
Angers Quince A, PQ BA-29, Angers Quince C (Cydonia oblonga) and Kainth (Pyrus
pashia) rootstocks. Both pear cultivars grafted on Kainth rootstock showed higher rate of
success percent than Quince rootstocks on the basis of biochemical tests viz., total soluble
sugars, total starch, phenols, peroxidase activity, nitrogen and growth pattern. Plant height
was significantly more in both the cultivars on Kainth rootstock as compared to the rest of the
rootstocks, being minimum on dwarfing rootstock Quince C. Maximum defoliation was
observed in stionic combination of Punjab Nakh/Kainth and minimum in Punjab nakh/Quince
C. The complete defoliation was noted in all stionic combinations during winter season. The
graft union girth was maximum in all stionic combinations followed by the rootstock girth
and scion girth. At both the stages, girth of rootstock, scion and graft union was more in
Punjab nakh than Punjab beauty cultivar irrespective of the rootstock used for grafting. Leaf
Chl a and total Chl content was maximum in Punjab nakh/Kainth combination at both the
stages and these values were significantly higher than other stionic combinations. The
concentrations of the biochemical entities for compatible graft union should be in regularity,
if pear cultivars will be grafted on Cydonia oblonga (Quince C) by inserting interstock to
overcome graft incompatibility.
Description
Keywords
null